CeramicSpeed T47 Bottom Bracket Description: With an integrated dust cover for all models, a snug & secure fit that also fully protects the face of the bearing delivers exceptional performance without any sacrifices. CeramicSpeed hand-built bearings carry the load from crank to frame with un-paralleled durability & efficiency. Features: Save watts and ride faster with guaranteed lowest friction, optimized power transfer, and longest product lifetime Coated Bearings: metallic layer that covers bearing races making them 75% harder than steel. Even lower friction and highly resistant to corrosion Super round CeramicSpeed balls and hardened-steel races Hand built in Denmark Specifications: Frame Interface: T47 Spindle Interface: SRAM DUB (28.99mm) Bottom Bracket Shell ID: 47 Shell Width: 73mm Color: Black Weight: -